feat(plugins,host): pluginRoot officiel transmis au contexte activate(ctx) des plugins — #285 (domain ports + infrastructure plugin: racine du package installé résolue depuis la même source de vérité que la substitution manifest ${pluginRoot}; application runtime_catalog + slash_command; backend dto + app-tauri dto_plugins; frontend domain + plugins runtime loader transmettent pluginRoot au contexte activé; bump pointeur IdeaSDK e3a0f46 via feature/285-plugin-root-runtime-api; QA verte: cargo check domain/application/infrastructure/backend/app-tauri, runtime_catalog 5/5, plugin_install_load 5/5, dto_plugins 2/2, frontend typecheck + 33 tests/3 fichiers, cargo fmt --check, git diff --check; réserves: rebuild AppImage + validation live ctx.pluginRoot dans le binaire actif restants)

frontend/src/domain/index.ts

@@ -2004,6 +2004,8 @@ export interface PluginRuntimePlugin {
    */
   activationScope?: "app" | "project";
   bundleUrl: string;
+  /** Canonical host-local root of the active installed plugin package. */
+  pluginRoot: string;
   iconUrl?: string;
   contentHash: string;
   contributes: PluginContributionDto;

frontend/src/features/plugins/PluginRuntimeProvider.test.tsx

@@ -23,6 +23,7 @@ function runtimePlugin(overrides: Partial<PluginRuntimePlugin> = {}): PluginRunt
     displayName: "Refreshable v1",
     version: "1.0.0",
     bundleUrl: dataUrl("export function activate() {}"),
+    pluginRoot: "/data/idea/plugins/installed/dev.acme.refreshable",
     contentHash: "v1",
     contributes: { menus: [], menuItems: [], layouts: [], mcpServers: [] },
     ...overrides,

frontend/src/features/plugins/plugins.test.tsx

@@ -101,6 +101,7 @@ class ProjectScopedRuntimeCatalogPluginGateway extends MockPluginGateway {
           version: "1.0.0",
           activationScope: "project",
           bundleUrl: this.bundleUrl,
+          pluginRoot: "/data/idea/plugins/installed/dev.acme.project-plugin",
           contentHash: "project-plugin",
           contributes: { menus: [], menuItems: [], layouts: [], mcpServers: [] },
         },
@@ -127,6 +128,7 @@ class MixedActivationScopeRuntimeCatalogPluginGateway extends MockPluginGateway
           capabilities: ["tooling"],
           activationScope: "app",
           bundleUrl: this.failingAppBundleUrl,
+          pluginRoot: "/data/idea/plugins/installed/dev.acme.app-needs-project",
           contentHash: "app-needs-project",
           contributes: { menus: [], menuItems: [], layouts: [], mcpServers: [] },
         },
@@ -136,6 +138,7 @@ class MixedActivationScopeRuntimeCatalogPluginGateway extends MockPluginGateway
           version: "1.0.0",
           activationScope: "project",
           bundleUrl: this.projectBundleUrl,
+          pluginRoot: "/data/idea/plugins/installed/dev.acme.project-plugin",
           contentHash: "project-plugin",
           contributes: { menus: [], menuItems: [], layouts: [], mcpServers: [] },
         },

frontend/src/plugins/runtime/loader.test.ts

@@ -29,6 +29,7 @@ function entry(overrides: Partial<PluginRuntimePlugin> & { bundleUrl: string }):
     id: "mock.plugin",
     displayName: "Mock Plugin",
     version: "1.0.0",
+    pluginRoot: "/data/idea/plugins/installed/mock.plugin",
     contentHash: "abc123",
     contributes: emptyContributes(),
     ...overrides,
@@ -39,17 +40,25 @@ describe("loadPlugins", () => {
   it("loads a well-formed plugin bundle and calls activate(ctx)", async () => {
     const bundle = dataUrl(`
       export function activate(ctx) {
-        globalThis.__activatedWith = ctx.pluginId;
+        globalThis.__activatedWith = { pluginId: ctx.pluginId, pluginRoot: ctx.pluginRoot };
         return {};
       }
     `);
     const { registry, failures } = await loadPlugins(
-      [entry({ id: "dev.acme.one", displayName: "One", bundleUrl: bundle })],
+      [entry({
+        id: "dev.acme.one",
+        displayName: "One",
+        bundleUrl: bundle,
+        pluginRoot: "/data/idea/plugins/installed/dev.acme.one",
+      })],
       gateways,
     );
     expect(failures).toEqual([]);
     expect(registry.list().map((p) => p.pluginId)).toEqual(["dev.acme.one"]);
-    expect((globalThis as Record<string, unknown>).__activatedWith).toBe("dev.acme.one");
+    expect((globalThis as Record<string, unknown>).__activatedWith).toEqual({
+      pluginId: "dev.acme.one",
+      pluginRoot: "/data/idea/plugins/installed/dev.acme.one",
+    });
   });
 
   it("loads an SDK-style default export containing activate(ctx)", async () => {
@@ -242,6 +251,7 @@ describe("loadPlugins", () => {
       "menu",
       "pluginDisplayName",
       "pluginId",
+      "pluginRoot",
       "services",
       "storage",
       "subscriptions",

frontend/src/plugins/runtime/loader.ts

@@ -38,6 +38,7 @@ export type { PluginGatewaySet } from "./registry";
 
 export interface IdeaPluginContext {
   pluginId: string;
+  pluginRoot: string;
   pluginDisplayName: string;
   version: string;
   logger: PluginLogger;
@@ -270,6 +271,7 @@ async function loadOne(
   const pluginId = safePluginId(entry);
   const displayName = nonEmptyString(entryObject.displayName) ?? pluginId;
   const version = nonEmptyString(entryObject.version) ?? "";
+  const pluginRoot = nonEmptyString(entryObject.pluginRoot);
   let activation: void | PluginActivation = undefined;
   const subscriptions: Disposable[] = [];
   try {
@@ -280,6 +282,9 @@ async function loadOne(
     if (!bundleUrl) {
       throw new Error("missing plugin bundle URL");
     }
+    if (!pluginRoot) {
+      throw new Error("missing installed plugin root");
+    }
 
     installHostReactImportMap();
     const mod = resolveIdeaPluginModule(
@@ -308,6 +313,7 @@ async function loadOne(
 
     const ctx: IdeaPluginContext = {
       pluginId,
+      pluginRoot,
       pluginDisplayName: displayName,
       version,
       logger: createPluginLogger(entry),